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How to initialize computational full of discrete particles to DPM or DDPM simulations

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Old   August 12, 2015, 04:51
Question How to initialize computational full of discrete particles to DPM or DDPM simulations
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Daniel Josť de Oliveira Ferreira
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Hi friends

How to initialize the case with a certain region filled with particles for DPM or DDPM simulation? I need to set up a initial patch for a determinate amount of particles in the computational domain before run the simulation.

Is there something like it is done for Euler-Euler simulations?
(where you can make initialize - patch - phase2 - volume fraction in a specif region)

thanks in advance
Daniel Josť
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Old   August 15, 2015, 07:31
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Jim
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Hi Daniel,
I have a problem that is quite similar to yours in my own simulations.
you need to have an injection (or injections) in order for DPM to be present in the model.
I believe DDPM also need to have an injection.
if you want to create an injection in every cell, I have found this is possible but not straight forward. the way I'm doing it currently is using a UDF to write an injection file.

If you're in 2D i think you can also do a surface injection, and activate an tickbox that will weight every injection according to the area of the cell face.

I think Fluent has a beta function called "volume injection" in recent releases (v15/16) but I haven't explored this myself.

n.b. I don't have a lot of experience with DDPM.
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Old   August 17, 2015, 08:52
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Daniel Josť de Oliveira Ferreira
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Quote:
Originally Posted by CFDYourself View Post
Hi Daniel,
I have a problem that is quite similar to yours in my own simulations.
you need to have an injection (or injections) in order for DPM to be present in the model.
I believe DDPM also need to have an injection.
if you want to create an injection in every cell, I have found this is possible but not straight forward. the way I'm doing it currently is using a UDF to write an injection file.

If you're in 2D i think you can also do a surface injection, and activate an tickbox that will weight every injection according to the area of the cell face.

I think Fluent has a beta function called "volume injection" in recent releases (v15/16) but I haven't explored this myself.

n.b. I don't have a lot of experience with DDPM.

Thank you so much CFDYourself

It worked for me in a initial test. I had some problems with divergence at the beginning but I could make a simple test with a small number of particles.

There is a pdf material with a lot of beta functions not only for disperse phase modeling, but for almost all modeling tools available in Fluent. Just search in google "Fluent 15.0 beta functions manual".

Thanks Again.
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